Oh no!!!! WHAT IF the new iPhone 6 has availability problems.....

It will be fully unlocked for GSM and LTE. But locked to Verizon for CDMA voice in the US. You should be able to use it just fine on Vodaphone. The only snag could be LTE if Vodaphone uses different LTE bands than the Verizon phone, but even then you would still have 3G voice and data. GSM and LTE are unlocked on Verizon because of a consent decree for a spectrum auction. They don't have a choice.
A full price ATT phone should also be unlocked even on day one.

I'm in no rush to get the iPhone 6 as my 5C is great. But I will be pre-ordering the iPhone 6 via Apple website when I can so I don't have to renew my contract with Telus. This way the phone will come when it comes and I don't have to wait in line at the apple store. Double bonus is that my contract with telus will be over in Oct 2015 and I will be free to go wherever I want.

What if there are problems finding, for example, a gold 64G iPhone 6 like there was with the 5s???? I couldn't get my current iPhone until....like...DECEMBER....

I REALLY hope that Apple has anticipated the demand for the gold devices!!!!

There is going to be, no doubt about it simply for the fact apple doesn't ramp up production until so close to launch. This is always the case with apple. If they would ramp up production 1-2 months earlier than they currently do, they would be fine for the most part. Not to mention the higher GB versions always seem to be manufactured less since not as many users buy those higher versions.

I agree with everyone else...it'll be crazy & there will be availability issues as usual. I lucked up & got a gold 5S on launch but I think it was because I got the 64GB. Hopefully, I'll have the same luck this year & I can get the color I want.

Nope, alive and well...just needed a little break is all. You know I had to come back to iMore to watch the tsunami of new device complaints and availability whining commence! I mean "What are we going to do?" if we can't have a new device 2 seconds after midnight on release day? I might actually cram a whole honey baked ham in my eye.